Assessment and planning
Inventory of mailboxes, permissions, mail flow and dependencies, with the migration approach and schedule agreed up front.
Service
Microsoft 365 & Exchange Migrations
Move mail and collaboration to Microsoft 365 with planned cutovers, clear communication and minimal disruption.
A mail migration touches every user in the business. Done well, people arrive the next morning to the same mailbox, calendar and shared resources on a better platform. Done poorly, it means lost mail, broken rules and a surge of support calls.
I have completed more than 65 Exchange to Microsoft 365 migrations from on-premises and hosted Exchange, including hybrid coexistence and DAG-based Exchange upgrades. Each follows a tested plan with a defined cutover window and rollback point.
Common challenges
- On-premises Exchange servers approaching end of support
- Hosted Exchange providers with limited export options
- Long coexistence periods with users split across two platforms
- Mail flow and DNS changes that must land at exactly the right moment
- Shared mailboxes, permissions and rules that must survive the move
What's included
Hybrid coexistence
Exchange hybrid configuration so users on both platforms share mail flow, free/busy and a single address book during the transition.
Hosted Exchange migrations
Structured moves from third-party hosted Exchange providers, covering data transfer and DNS cutover.
MX and Autodiscover cutover
Planned DNS changes timed to avoid lost or delayed mail, with delivery validated before and after cutover.
Exchange server upgrades
DAG-based Exchange upgrades for organisations that retain on-premises Exchange.
Tenant configuration and aftercare
Licensing, shared mailboxes, groups, mail flow rules and Teams configured, with support through the first days after cutover.
Approach
Assess
Review the current mail platform, data volumes, permissions and integrations.
Plan
Agree migration batches, user communications, the cutover window and a rollback point.
Migrate
Start with a pilot group, then move in staged batches with pre-staged data to keep cutover short.
Stabilise
Verify mail flow, support users and guide the decommissioning of legacy servers.
Proven in practice
- More than 65 Exchange to Microsoft 365 migrations completed, including hosted Exchange clients
- Exchange hybrid coexistence deployments for staged migrations
- DAG-based Exchange upgrades for organisations retaining on-premises servers
- Sole Microsoft 365 owner for a large contracting group, managing Exchange Online mail flow and the full user lifecycle
Technologies
- Exchange Online
- Exchange Server
- Exchange Hybrid
- Microsoft 365
- Entra ID
- Directory synchronisation
- Microsoft Teams
- PowerShell
- DNS
Tools change. Good engineering doesn't. I work with the platforms already in place and adapt quickly to new ones.
Frequently asked questions
How long does an Exchange to Microsoft 365 migration take?
Smaller organisations can often migrate within a few weeks, including planning and a pilot. Larger or hybrid migrations run in stages over a longer period. The timeline is agreed during assessment, based on mailbox count, data volume and coexistence needs.
Will users lose email during the cutover?
The migration is designed to prevent it. Data is pre-staged, mail flow changes are timed carefully and delivery is verified before and after cutover, with a rollback point defined in advance.
Can you migrate from a hosted Exchange provider?
Yes. Hosted Exchange moves make up a significant share of the more than 65 migrations I have completed, including planning around provider export limitations.
Do we need Exchange hybrid?
Hybrid suits larger organisations and staged moves that need shared calendars across platforms. Smaller organisations often migrate faster without it. The assessment recommends the right option for your environment.
Related services
Discuss your requirements
Share the details of your Microsoft 365 & Exchange Migrations project and I will outline a practical approach for your environment.
Get In Touch